Extension holder for bits



Jan, 6, 1925.

Y C. R. HOLMES EXTENSIQN HLDER FOR BITS Filed April 17, 1925 l ATTORNEYS,

Patented dan. 6, 1925. u

entre er iinrnnsron` nonnen.-nonnifis.V

A4ApplicationledA'pril-17,.1923. Seria1-No'..632,652.

Toall w home2? may concern: Be -itx knownthat I, CHARLES R. HOLMES, Y arcitfizen `oi the United States,r.and a `resident offNeWark, in the county=of Essex andSta-te .A n y ing the parts in l-the .position shovvnv in lil-ig. and' i of New. Jersey5-liave inventednevv. and use- Improvements in Y Extension Holder-s for Bits, ot' which the following is aspecication..

This inventionrelates in. general to, a bit holder adapted tobeconnected to av brace, handle or other operating' mechanismlto provide an extensionfor.' the;v bit whenk it,is desiredv touse the bit inf otherwise inaccessible.` placesA or- Where itV is, desired to bore a hole: longer 'than the usual drill.A bit and shank. Moreparticularly'the invention relates to a chuckv for holding thebit in. an extension piece, although .the chuck-1 enibodying; the invention is equally Well adapt 20. ed for Vmany other purposes.

@ne-object offtheinvention is to provide.

a: chuck of? the.- character described. embodying novel and improved features of construction 'which includes :ii-.small number of. compactly. arranged.- parts soi-that the Y chuck is offqmi'niinumsize and canbe usedinrestricted-spaces'andfollowradrillbitthrough 1 an unusually longopeninggat the Sametime` 'providing astrong, ,f durable Vand simply op er ated holdenfor .the loit.y

' Furtherobjects of the invention. are to prov-ideabit-,holderor chuckoff this charaotere comprising af. body f portion 1 having a socket to ,receive a -bit or the like and .formed rotation of; said bit',4 af sleeve longitudinally slide-bleA and rotatableJ on said-.body portioni and irmedwith'lugs-to enterjbetvveensaid. y fingers and engage said. head ofthe4 bit`- Referringto ftheaccompanying. drawings, 7: i) -inwliiehv flikef' nuiner als oit-.reference .indicate correspondingand 'likef parts,

Figure lisa-*flengitu-dinal vertical. section al vieav :through air extension holden and chuck for bits embodying t my invention clampedi Within [the chuck-g lingers being rounded or with' anplurality, of spaced -iingersto V*prevent tat-ably, mounted. on thef reduced l 1 of 'theQshank- Eigure lisa-similarview showing the bit'` FigureV 3 is an enlarged end elevation of the chuckf'sho-Wingthe partsin the position shown in Fig. 1;

'Figure 1l' is? a.- vievv similar'to Fig. 3 show- Figure 5'is a perspective vievvofthe body portion i ofthe chuck-y inverted`v` vvith the actuating. bushing and locking sleeveremoved. Infthe embodiment ofthe invention' shown i on the. drawings, the reference `character'A designates --the'xshankof. an extension: rpiece vvone end otivhichs provided Witha polygonal and outwardly taperedhead B to fit :into the usual chuck of' a brace,.handle or other operating mechanism. The other end oisaid extension piecev A is'formed' with a reduced portion l adapted tosnugly fit Within a correspondinglyV shaped' opening Quin-fone endl of asleeve said sleeve being fixedly secured tosaid shank in any suit-able manner aswby` means of a pin Ll. The other r`end of said sleeve 3 is'provided with aipyluralityI oftequidistantly circumfer- --entially spaced longitudinally extending `fingers 5"-o'rming bet-fvveenV them' longitudi- 5'0,the' outer ends of said beveled as at 6. At the base ofLsaidiigersthesleeve 3 is formedlwith tvvo. co-axialineeting openings 7. and 8 the ou-ter. one of; which tapersV inwardly, from the ybases .9"of said: fingers to the other openingand provides scatto receivefthe head C of tlieshank-D of abit E to be securedzin`n he chuck. YThe external diameter 4ofthe' sleeve r3 is'preferably substantiallyl .equallto the" d' ameter' of a circle circumscribe'djon the larger endV offsaid head CY oiithe shank D of the bit El VThereduced portion 1 off the shankA" andthe' sleeve 3 nal. parallel lslots .thus forma body7 portion for the chuck embodyingmy invention.

. A lockingjsleeve l1 is'longitudinally slidably and rotatably mountedonthe sleeve 3,

and `the outer endiot'saidA locking sleeve is provided With'a'pxluralityof inwardly proecting lugs 12 corresponding Ainnum'ber to Widthi adapted to iit the.. ngers 5l. and of: a-

the said `'fingers 5.

in i the slots between The other endof saidsleevell is internally threaded at 13,' .preferably Y vlei'tlliand'7 to engage an externallyith'read'ed'bushing 14 ropvortion 1 fi between a .shoulder'l and the inner end .of .the sleeve3. Tliebushing 14 is thus vsubstantially longitudinallyetixed on the shank A except for a slight play necessary to permit easy rotation thereof.

In the operation of the chuck embodying my invention, when it is desired to insert a bit within the chuck, the bushing 14 is rot-ated to slide the locking sleeve 11 outwardly to remove the lugs 12 from between the fingers 5, after which the sleeve 11 is rotated to place said lugs 12 in substantial alineinent with the respective fin- The head C of the bit is then inserted with the corners thereof arranged between the fingers, as clearly shown in Fig. 3, the extremity of said head seating in the opening' 7, The sleeve 11 is then rotated to bring the lugs 12 into alinement with the spaces between the fingers 5, whereupon the bushing 14 is rotated in the proper direction to slide the sleeve 1l inwardly and cause the lugs 12 to engage the inner end or shoulders of the head C of the bit, as shown in Fig.v 4. The head C of the bit is thus forced into snug engagement with the seat 7 and thereby centered in the chuck, and is; prevented from longitudinal movement out of the sleeve 3 by the lugs 12. Rotation of the head C in the sleeve 8 is prevented by the fingers 5 and by the engagement of the head with the seat 7 which is produced by the inward pull exerted on the head C as the sleeve 11 is forced inwardly by rotation of the bushing 14. To remove the bit from the chuck the bushing 14 is rotated to slide the sleeve l1 outwardly as above described for inserting the bit, after which the said sleeve is rotated to bring thelugs 12 Vinto alinement with the fingers 5. The bit can then be easily shipped longitudinally outward from the sleeve 3.

lt will be observed that this construction comprises a small number of compactly arranged parts, and enables the chuck to be made of a size easily adapted for use in extremely restricted places, or of a size smaller than the bit E so as to be adapted to follow said bit through an unusually long opening being bored by the said bit. Also, the chuck provides a Strong and durable holder for the bit which will withstand all the hard usage to which such devices are usually subjected, and the operation of attaching a bit to or removing the same from the chuck is extremely simple.

The seat? centers the bit in the chuck and the fingers 5 and said seat effectively prevent wabbling of the bit in the chuck when the sleeve l1 is in locking position.

It will be understood that while I have shown the chuck o-r holder for use in connection with extensions for bits, it is equally well adapted for other purposes where a chuck of this character is desired, and furthermore, while I have shown the device used in connection with the drill bit E. the invention is also susceptible of use with any other type of bit, such as a screw driver o1' other similar devices or tools.

I have illustrated and described a chuck or bit holder embodying certain details of construction, but it will be understood that this is mainly for the purpose of illustrating the principles of the `invention and that many modifications and changes can be made in the construction of the chuck without departing from the spirit or scope of the inh vention. Thereofore, l do not desire to be understood as limiting myself, lexcept as required by the following claims when construed in the light of the prior art.

Having thus described the invention, what I claim is:

1. A device of the character described comprising two relatively longitudinally movable and rotatable members, one of which is provided with a socket to receive an article to be held and having a plurality of longitudinal slots therein, and the other of which is formed with a plurality of projections adapted to enter said slots and engage said articleto hold the same against longitudinal movement out of said socket, and means for positively producing relative longitudinal movement of said members to cause engagement and disengagement of said projections with said article for clamping said article in or removing it from said socket.

2. A. device of the character described including a body portion formed with a socket including a plurality of Vspaced fingers providing longitudinal slots therebetween, said socket being adapted to receive an article to be held, and a locking member having a Ylongitudinally movable and rotatable relation with said body portion and formed with a plurality of projections adapted to enter through said slots and engage said article to hold it in said socket, and means for positively producing longitudinal movement of said locking member to cause engagement and disengagement of said projections with said article for clamping said article in or removing it from said socket.

3. A device of the character described including a shank having a'reduced end pori' tion with a shoulder at the inner end thereof, a body sleeve fiXedly mounted on said reduced portion in spaced relation to said shoulder and formed with a plurality of longitudinally projecting circumferentially tion of the shank between said'shoulder and if* i lll) `\ other' of which is the inner' end of said body sleeve and having a threaded connection with said locking sleeve to longitudinally move the same on said body sleeve to cause engagement and disengagement of said projections with said article for clamping said article in or removing it from said socket.

4. A device ot the character described comprising two relatively longitudinally movable and rotatable members, one of which is provided with a'A socket having a seat therein to receive an article to be held and formed with a plurality of longitudinal slots outwardly of said seat, and the formed with a plurality of projections to enter through said slots in opposed relation to said seat to clamp an object between said projections and said seat, and means for positively producing relative longitudinal movement of said members to cause engagement and disengagement of said projections with said article tor clamping said article in or removing it from said socket. Y

:l device of the character described including a body portion having a socket therein formed with a seat to receive an article to be held, said body portion being formed with a plurality of longitudinal slots outwardly of said seat and opening through the end of the body portion, a locking sleeve rotatable and slidable on saidv body portion and formed with a pluralityl of inward projections one of which is adapt ed to enter through each of said slots in opposed relation to said seat to engage said article and hold it on said seat, land means for positively producing longitudinal movement of said locking sleeve on said body portion to cause engagement and disengagement of said projections with said article for clamping said article in or removing it from said socket.

6. A bit holder of the character described including a body portion having a socket of a diameter less than that of a circle circumscribed on the large end of the polygonal head of the shank a bit, said socket having a seat and a plurality of equidis-tantly circumferentially spaced longitudinal slots opening through the end of said body portion, said slots being adapted to receive the corners of the head of a bit shank and guide said head to said seat in the socket, a locking sleeve rotatable and longitudinally slidable on said body portion and formed with inwardly projecting lugs to enter through said slots in opposed relation to said seat and engagel the shoulders at the inner end of said head of said bit shank to hold said head in said seat, and means for positively producing rlongitudinal movement of said locking sleeve on said body portion to cause engagement and disengagement-of said projections with said head for clamping said bit in or removing it from said socket.

CHARLES R. HOLMES.. 

